title: Effects of volatile compounds on consumption of alfalfa pellets by sheep.
abstract: We examined the effects of six volatile compounds on alfalfa pellet consumption by lambs. In each experiment, 45 lambs were individually fed alfalfa pellets sprayed with a selected compound (camphor, limonene, cis-jasmone, beta-caryophyllene, borneol, or alpha-pinene) at one of five concentrations. Treatment concentrations were multiples (0, .5, 1, 2, and 10) of the concentration of a specific compound (X) that was related to differential herbivory of tarbush by livestock in previous studies. Treatments were applied to alfalfa pellets (.64 kg x lamb(-1) x d(-1), DM basis), and consumption was measured during a 20-min interval each morning for 5 d. Lambs were adapted to handling procedures and the pelleted diet (without treatments) for 10 d. Lambs were maintained and fed (approximately 4.5 to 5% of BW) as one group except during 20-min tests. A negative linear effect of treatment concentration on intake was observed for camphor (P < .02) and alpha-pinene (P < .01), and a quadratic response was detected for borneol (P < .02). The other three compounds had no discernible effect on consumption. Although volatile compounds generally had only minor influences on consumption, the negative influences of alpha-pinene and camphor concentrations on pellet consumption suggest that these monoterpenes may partially explain differential herbivory of individual tarbush plants by livestock.
authors.affiliation: USDA/ARS Jornada Experimental Range, Las Cruces, NM 88003-0003, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Estell
authors.forename: E L
authors.initials: EL
authors.lastname: Fredrickson
authors.forename: M R
authors.initials: MR
authors.lastname: Tellez
authors.forename: K M
authors.initials: KM
authors.lastname: Havstad
authors.forename: W L
authors.initials: WL
authors.lastname: Shupe
authors.forename: D M
authors.initials: DM
authors.lastname: Anderson
authors.forename: M D
authors.initials: MD
authors.lastname: Remmenga
mesh_terms: D000284:Administration, Oral; D000704:Analysis of Variance; D000818:Animals; D000081008:Bicyclic Monoterpenes; D001892:Camphanes / Q000008:administration & dosage / Q000494:pharmacology; D002164:Camphor / Q000008:administration & dosage / Q000494:pharmacology; D053138:Cyclohexenes; D003517:Cyclopentanes / Q000008:administration & dosage / Q000494:pharmacology; D004032:Diet / Q000662:veterinary; D004063:Digestion / Q000187:drug effects* / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects*; D000077222:Limonene; D000455:Medicago sativa / Q000378:metabolism*; D039821:Monoterpenes; D054883:Oxylipins; D000081223:Polycyclic Sesquiterpenes; D011897:Random Allocation; D012717:Sesquiterpenes / Q000008:administration & dosage / Q000494:pharmacology; D012756:Sheep / Q000378:metabolism* / Q000502:physiology; D013729:Terpenes / Q000008:administration & dosage / Q000494:pharmacology; D013997:Time Factors
chemical_list: D000081008:Bicyclic Monoterpenes; D001892:Camphanes; D053138:Cyclohexenes; D003517:Cyclopentanes; D039821:Monoterpenes; D054883:Oxylipins; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; D013729:Terpenes; D002164:Camphor; D000077222:Limonene; C024714:caryophyllene; C005451:alpha-pinene; C022871:isoborneol; C086299:jasmone